Compared to regular CNC lathes, turning center turning turrets are equipped with power tools that can rotate milling cutters, drill bits and taps. At the same time, the machine spindle also has a C-axis feature that can be accurately indexed by NC programs and interpolated on the X-axis or (and) Z-axis. This 3-axis (X, Z, C) control turning center can be used for turning, milling, drilling, boring and tapping parts with a single clamp. It is the most widely used rotating body compound processing machine in industrial production.
However, regardless of how the single-spindle turning center expands the machining range, it is still impossible to solve the problem of secondary machining of the rear part of the shaft part under one clamp (ie, workpiece). Processing of holding edge). This should be done at the twin spindle turning center. Twin Spindles Most of the two spindles in a turning center are located on the same axis and opposite each other. Therefore, after the main end of the shaft part has been machined, the second spindle will automatically pick up the workpiece from the spindle and machine the clamp end.
Since the machining operation at the clamp end is generally relatively simple, the second spindle is often referred to as the counter spindle and its output is relatively small. Twin spindle turning centers can be equipped with tool holders, most of which are two tool holders that improve machining efficiency and maximize the potential of machine tools. The machine has a main shaft and a sub-spindle facing the same axis on the bed, usually the speed of the double main shaft is 0-4000r / min, both can be controlled by the C axis. You can also move the counter spindle in the axial direction to pick up workpieces machined at one end of the spindle. There are 10 turrets around the spindle and under the counter spindle. Each tool position on the turret can be equipped with a power tool with a specific output and speed of 80-8000 r / min. The upper tool holder is controlled by 3 axes (X1, Y1, Z1) and the lower tool holder is controlled by 2 axes (X2, Z2).
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- For the twin spindles on the opposite side, the output and speed of the main spindle and auxiliary spindle are the same. The top and bottom tool holders have the same power and the same functionality.
- Simultaneous rotation of 4 axes is possible. The main and sub-spindles can synchronously transfer and hold workpieces without stopping machining. As a result, all front and back processing from blank to finished product is completed, the processing tempo of the work is greatly reduced, and the processing time is reduced by about 40%.
- With the milling function, the driving force of the rotary tool spindle is 5.5kW.
- Machining double tool holders using left and right spindles and top and bottom composite turrets to integrate machining operations that previously had to be split into multiple processes. A high-precision linear guide is used to maintain stable machining accuracy even after long-term continuous machining.
Link to this article：Turning both ends of shaft parts
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